基于水文水动力模型的浦阳江流域洪水情景模拟

Flood Scenario Simulation Based on Hydrologic-Hydrodynamic Integrating Model in Puyang River Catchment

浦阳江流域地形复杂,包括山丘、盆地和平原。中游诸暨盆地是人口主要聚集地,受上游山区洪水和下游钱塘江潮位顶托影响,洪涝灾害形势严峻。为解决上述问题,本文对流域上游山区采用新安江水文模型模拟降雨径流过程,对下游盆地区采用IFMS一、二维水动力模型模拟水流运动,并以水文模型的计算结果作为水动力模型的边界条件进行水文水动力模型耦合。结果表明水文水动力模型适用于浦阳江全流域洪水模拟,能够弥补新安江模型中马斯京根汇流无法考虑潮水顶托影响以及水动力模型难以响应降雨变化的不足。根据地区防洪特点设置致灾因子变化和水利工程建设两类情景进行洪水模拟,得到不同条件下浦阳江流域的洪水淹没水深分布,通过结果分析,总结得出浦阳江流域洪涝问题的解决对策和建议。

The terrain of Puyang river catchment is complicated,including hill,basin and plain.Zhuji Basin,which is located in the middle of the catchment,is a densely-inhabited area and flooding is a severe issue there due to upstream flood and downstream backwater.To solve the problem,this article integrated the Xin'anjiang hydrologic model and IFMS 1D-2D hydrodynamic model together to simulate flood inundation.Xin'anjiang hydrologic model is used to simulate the rainfall-runoff process in upstream area while IFMS 1D-2D hydrodynamic model is targeted at water flow movement simulation in downstream area.The results demonstrate that hydrologic-hydrodynamic integrating model is a feasible method to describe the whole catchment flood process which is able to remedy the deficiencies of single model simulation.In addition,different flood scenarios which consider both disaster-inducing factors and flood control engineering are simulated to calculate the water depth distribution in different conditions.Through its result analysis,resonable advice for local flood management can be offered.